Objective:To examine the structure of persistent postconcussive symptoms in a sample of patients with mild traumatic brain injury.Design:Multivariate discriminant analysis in a series of 50 consecutive clinical referrals evaluated for postconcussive symptoms, neuropsychological functioning, and personality and emotional functioning at least 3 months after injury; follow‐up information regarding level of disability was obtained for 37 patients at least 1 year after injury.Setting:Neuropsychology clinic affiliated with a comprehensive brain trauma rehabilitation center.Patients:50 consecutively referred patients with a diagnosis of mild traumatic brain injury referred by physicians, rehabilitation nurses, or attorneys because of persistent deficits or subjective complaints consistent with a postconcussion syndrome.Main Outcome Measure:Postconcussive symptoms endorsed on the Post Mild Traumatic Brain Injury Symptom Checklist.Results:Four factors consisting of multiple symptoms were identified: cognitive factor, affective factor, somatic factor, and sensory factor. Using these four factors, K‐means cluster analysis of subjects was applied to classify patients. Patient clusters consisted of those with minimal symptoms, those with primarily cognitive‐affective symptoms, those with prominent somatic symptoms, and those with severe global symptoms (P = .000). Patient symptom clusters were largely unrelated to neurological or neuropsychological functioning. The presence of chronic disability and resumption of productive functioning differed significantly among groups (P = .003).Conclusions:Subjective complaints provide clinically meaningful information and are strongly related to the nature and extent of disability after mild traumatic brain injury. Characterization of a single postconcussive syndrome may be misleading, and it may be more meaningful to define a number of postconcussive syndromes with differing symptom profiles and recovery.